Can Not Hear Caller.

I have a Timmy E86 Android smartphone. After the first time I used the headphone to listen to music I can no longer hear when I call someone or they call me, they can hear me. I have to go into the speaker mode to hear them. If I'm using my Blutooth everything is fine. I've tried rebooting the phone, disconnecting the battery and then rebooting again. I've also tried plugging the headphone jack in and out to see if the micro switch would switch back to no avail. I've installed the Soundabout App, but that was of no help, I've tried the mute and unmute microphone App and as a last resort access the cell phone code *#*#3646633#*#* but did not find anything in there to solve my problem.